| 100BASE-FX | A physical medium defined in the IEEE 802.3 Ethernet standard for local area networks (LANs) that uses fiber optic cabling |
| 100BASE-TX | A physical medium defined in the IEEE 802.3 Ethernet standard for local area networks (LANs) that uses twisted-pair cabling category 5 or higher with RJ-45 connectors |
| 615 series | Series of numerical protection and control relays for protection and supervision applications of utility substations, and industrial switchgear and equipment |
| AC | Alternating current |
| ACT |
1. Application Configuration tool in PCM600 2. Trip status in IEC 61850 |
| ANSI | American National Standards Institute |
| CAT 5 | A twisted pair cable type designed for high signal integrity |
| COMTRADE | Common format for transient data exchange for power systems. Defined by the IEEE Standard. |
| CPU | Central processing unit |
| CSV | Comma-separated values |
| CT | Current transformer |
| DAN | Doubly attached node |
| DC |
1. Direct current 2. Disconnector 3. Double command |
| DHCP | Dynamic Host Configuration Protocol |
| DNP3 | A distributed network protocol originally developed by Westronic. The DNP3 Users Group has the ownership of the protocol and assumes responsibility for its evolution. |
| DPC | Double-point control |
| DST | Daylight-saving time |
| EEPROM | Electrically erasable programmable read-only memory |
| EMC | Electromagnetic compatibility |
| Ethernet | A standard for connecting a family of frame-based computer networking technologies into a LAN |
| FB | Function block |
| FIFO | First in, first out |
| Firmware | System software or hardware that has been written and stored in a device's memory that controls the device |
| FPGA | Field-programmable gate array |
| FTP | File transfer protocol |
| FTPS | FTP Secure |
| GOOSE | Generic Object-Oriented Substation Event |
| HMI | Human-machine interface |
| HSR | High-availability seamless redundancy |
| HTTPS | Hypertext Transfer Protocol Secure |
| HW | Hardware |
| IEC | International Electrotechnical Commission |
| IEC 60870-5-103 |
1. Communication standard for protective equipment 2. A serial master/slave protocol for point-to-point communication |
| IEC 61850 | International standard for substation communication and modeling |
| IEC 61850-8-1 | A communication protocol based on the IEC 61850 standard series |
| IEC 61850-9-2 | A communication protocol based on the IEC 61850 standard series |
| IEC 61850-9-2 LE | Lite Edition of IEC 61850-9-2 offering process bus interface |
| IED | Intelligent electronic device |
| IEEE 1686 | Standard for Substation Intelligent Electronic Devices' (IEDs') Cyber Security Capabilities |
| IP address | A set of four numbers between 0 and 255, separated by periods. Each server connected to the Internet is assigned a unique IP address that specifies the location for the TCP/IP protocol. |
| IRF |
1. Internal fault 2. Internal relay fault |
| IRIG-B | Inter-Range Instrumentation Group's time code format B |
| LAN | Local area network |
| LC | Connector type for glass fiber cable, IEC 61754-20 |
| LCD | Liquid crystal display |
| LCP | Liquid crystal polymer |
| LCT | Life cycle traceability |
| LE | Light Edition |
| LED | Light-emitting diode |
| LHMI | Local human-machine interface |
| MAC | Media access control |
| MMS |
1. Manufacturing message specification 2. Metering management system |
| Modbus | A serial communication protocol developed by the Modicon company in 1979. Originally used for communication in PLCs and RTU devices. |
| Modbus ASCII | Modbus link mode. Character length 10 bits. |
| Modbus RTU | Modbus link mode. Character length 11 bits. |
| Modbus TCP/IP | Modbus RTU protocol which uses TCP/IP and Ethernet to carry data between devices |
| NCC | Network control center |
| PA | Polyamide |
| PBT | Polybutylene terephthalate |
| PC |
1. Personal computer 2. Polycarbonate |
| PCM600 | Protection and Control IED Manager |
| PRP | Parallel redundancy protocol |
| PTP | Precision Time Protocol |
| R/L | Remote/Local |
| RAM | Random access memory |
| RJ-45 | Galvanic connector type |
| RoHS | Restriction of hazardous substances |
| ROM | Read-only memory |
| RS-232 | Serial interface standard |
| RS-485 | Serial link according to EIA standard RS485 |
| RSTP | Rapid spanning tree protocol |
| RTC | Real-time clock |
| SAN | Single attached node |
| SCL | XML-based substation description configuration language defined by IEC 61850 |
| Single-line diagram | Simplified notation for representing a three-phase power system. Instead of representing each of three phases with a separate line or terminal, only one conductor is represented. |
| SLD | Single-line diagram |
| SMT | Signal Matrix tool in PCM600 |
| SMV | Sampled measured values |
| SNTP | Simple Network Time Protocol |
| ST | Connector type for glass fiber cable |
| STP | Shielded twisted-pair |
| SVG | Scalable vector graphics |
| SW | Software |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| UTC | Coordinated universal time |
| VT | Voltage transformer |
| WAN | Wide area network |
| WHMI | Web human-machine interface |
| XRIO | eXtended Relay Interface by OMICRON |